Furnace door



June 29 F. W. MARTIN FURNACE DOOR Filed May 1.6,. 1924 2 Sheets-Sheet 1 ATTORNEY June 29 1926.

F. w. MARTIN FURNACE DOOR Filed May 16, 1924 2 Sheets-Sheet 2 4 7 INVENTOR BY I ATTORNEYS I fere, so that such door plates Patented June 29, 1926.

TENT ()FF-ICE.

FREDERICK W. MARTIE, (3F BBQGKLYH, NEVJ YORK, ASSIGNOR TO FRANKLIN RAIL- WAY SUPPLY CQMPATQY, A

CORPORATION OF DELAWARE.

FUBLETACE DOOR.

Application filed May 16, 1924. Serial No. 713,687.

My invention relates to furnace doors and the like, such for example, as'are used on steam locomotives. It is especially advan-- tageous for stoker fired locomotives, on ac count of the compactness of operation which it permits. In the case of stokers which have tubes or discharge members extending through the rear wall or baclr head of the fire box, door plates which swing edgewise across the door opening particularly intercannot be mounted to good advantage, or even cannot be used at all. My invention not only obviates such ditficulties, but also afiords a smoother, easier door action, and minimizes shock in closing.

In the drawings, Fig. 1 is a front elevation of a furnace door structure conveniently embodying my invention, certain parts being partly broken away.

Fig. 2 shows a horizontal section, taken as indicated by the line 2-2 in 1.

Fig. 3 is an end or side elevation, from the left of Fig. 1.

Fig. 4 shows the structure of Figs. 13 applied to the fire box of a steam locomotive, with the door open and various parts in sec tion, and with an operating cylinder and piston mechanism also partly in section.

The structure here shown comprises a door frame 10 adapted to be mounted. on the rear wall of a fire box (Fig. 4), at itsopening 11, and to carry the various operating parts. In the present instance, the movable door structure moves edgewise across the opening 11 to open and close, in the main horizontally. Also, the moving door comprises complemental halves or units that swing apart and together to open and close, being fulcrumed on pivot studs13, 13 mounted on the frame 10 over the opening 11.

Instead of being all one part, as heretofore, however, each of the moving door halves itself comprises a plurality of sections, each covering a portion of the corresponding half of the opening 11. In the present instance, there are two such sections, 14 and 15, to each door half, and when closed they overlap somewhat, as shown in Fig. 1. As shown, the inner or central section 14 is in front of the outer or lateral section 15. These sections 14, 15 are biased to close automatically as by the distribution of their weight in reference to their fulcra 13, 13, and are pivoted concentrically. The

outer sections 15, 15 are so operated that when the door is opened they move into more complete overlap with the inner sections 14, 14, as shown in Fig. 4; and thus the door opening 11 can be completely un covered without conflict with the discharge connections 16, 16 from the stoker elevators 1.7, 17, In the present instance, the inner S6Ct1OI1S 14-., 14, which have farther to move in opening, are alone directly actuated, and the outer sections 15, 15 are actuated by interconnection with the inner ones. As shown, differential, movement and progressive uncovering of the door opening are secured by lost motion: .i. e., the inner sections 14, 14 open part way before projections or flanges 1.8, 18 at their inner edges engage the inner edges of the outer sections 15,15, and so carry them along with them in their farther outward swing. i

As shown, the inner sections 14, 14 are in terconnected and constrained to move in unison by mtermeshing gear segments, 19, 19,; and a piston 20 (Fig. 4) in an operating cylinder 21 mounted on the pivots 13, 13 in one of the sections 14 by a link 22. When the door is closed, the sections 14, 14 abut I and overlap at their rabbetted inner edges, and overlap the sections 15, 15 at their outer edges; also, the lower, free ends of cooperatlng sections 14, 15 are engaged behind overhanging lugs 23 on the frame 10, and thus held against internal pressure inside the fire box.

As regards the geared interconnection and the fluid motor actuation of the innersections 14, 14, the mechanism shown resembles that of locomotive doors already in use, so that detailed description thereof is unnecessary: suffice it to say that when fluid pressure is admitted to the inner or left-hand side of the piston, the sections 14, 14 are swung open to the positions shown in Fig. 4; while when the pressure is relieved, they return and close by gravity as in Fig. 1. In practice, of course, the movements and the impact of the sections 14, 14 on coming together may be eased or cushioned in any usual or preferred manner, as by the action of the piston 20 itself. The closing movements of'the outer sections 15, 15 may also be definitely and finally limited in any suitable way, as by engagement of flanges or lugs 24, 24 at their outer edges with the door frame 10 (Figs. 1, 2, and 3), so that the sections 15, cannot swing on all the way inward with the inner ones and leave the opening 11 uncovered at either flank.

It will be seen that the operation of the door is very compact, since the substantial coincidence of corresponding sections 14, 15

when open minimizes the space required.-

1 and the range of movement required of the piston is less.

I claim l. A fire box door comprising, in combination, a door pivot, and a plurality of sections mounted thereon and arranged to progressively uncover or cover the fire door opening.

2. A fire box door comprising, in combination, a door pivot, and a plurality of sec- :tions mounted thereon and progressively movable in the same direction to uncover or cover the fire door opening.

3. A fire box door comprising, in combination, a door pivot, and a plurality of over lapping sections mounted thereon and progressively movable in the same direction to uncover or coverthe fire door opening.

4:. A fire box door comprising, in combination, a door pivot, and a plurality of overlapping sections mounted thereon, and motor means directly actuating one section, the actuated section coming in contact with and moving another section to uncover the door opening. I

5. A fire box door comprising, in combination, a door pivot, and a pair of door sections mounted thereon, one of which during opening movement uncovers a portion of the door opening before movement of the other ,section takes place and thereafter comes in contact with and moves theother section to complete uncovering of the door opening.

6. A fire box door according to claim 5,

wherein both sections move in unison during lnltial closing movement, wlth means for stoppmg one section in position to cover one portion of the door opening, the other.

section thereafter moving alone to complete the covering.

7. A fire box door composed of two oppositely movable units each of which comprises a plurality of sections mounted upon a pivot and progressively movable in the same direction to uncover or cover the fire door openin I 8. A fire box door composed of two oppositely movable unitseach of which comprises a plurality of sections progressively movable in the same direction to uncover or cover thefire door opening, motor means for actuating one of said units, and means for interconnecting the units for simultaneous operation.

9. A fire box door comprising a door pivot and separate overlapping sections mounted thereon and moving edgewise across the door opening, and means for moving one of said sectionsv into farther overlapping relationship with the other as the door is opened. I v

10. A fire box door comprising a door pivot, separate sections mounted thereon and moving edgewise in the same direction across the door opening, with actuating means for the section that moves farther in opening, and means of interengagement whereby said section actuates the otherafter opening part Way.

11. A fire box door comprising separate sections mounted on a common pivot to swing edgewise, and close of themselves, across the door opening, with actuating means for opening one of said sections and means of interconnection for swinging the other into overlapping relationship with that first mentioned when opened. 12. A locomotive having in combination a back head, a stoker discharge member extending through said back head, a fire door opening in the back head adjacent said dis 

